Deformed reenforcing bar for concrete



De@ u", w23. M7137@ C. G. OHLSON ET AL DEFORMED REEN-FORCING BAR FOR`CONCRETE Filed Sept. 2l 1921.

INVENTORS Patented l'lec.` il, i923.

STATES ignara retratar critico CARL G. OHLSON AND ALFRED E. SUPP, OFYOUNGSTOWN, OHIO.

DEFORMED REENFORCING-BAR FOR CONCRETE.

Application led September 21, 1921.

To all whom it may concern:

Be it known that we, CARL G. (lr-inscri and ALFRED E. Juri?, bothcitizens ci the United States, residing at Youngstown. in the county ofMahoning and State of Ohio, have invented a new and useful Improvementin Deformed Reeniorcing Bars for Concrete, oi? which the following is afull, clear, and exact description.

Our invention relates to reenforcing bars for concrete of `the typehaving substantially uniform cross-section and tensile strength.

Heretofore in such type of bars the sub- M3 stantial conformity of crosssectional area has been obtained by shaping the bar so that one portioncounteraoted another portion at each cross section; for example by arecess in one portion counteracting a projee-tion in another portion, atthe same cross section.

Our invention is designed to provide such a bar with a plurality ofportions having undulations so arranged that the transverse section ofeach of said portions is substantially constant throughout the length otthe bar: so that each portionis self compensating.

A further object of our invention is such an arrangement that theportions referred to in the last preceding paragraph constitute theentire bar, and may be placed in any longitudinal relation to eachother, and a bar of substantially uniform cross-section and tensilestrength will be produced. That is to say, the portions themselves areselli compensating, and have a substantially uni- `form transversecross-sectional area at every point, and therefore the longitudinalrelation of the portions with respect to each otheris immaterial as faras it affects the sectional area and tensile strength of the bar. Thisis of importance in making such deformed bars as the rolls usedsometimes slightly displace the port-ions of thevbar in the formingthereof.

Further objects of our invention will be apparent upon reading thefollowing description taken in connection with the acof Figure Lcompanying drawings which illust-rate two serial No. maier'.

Figure 3 is a view similar to Figure l with the bar rotated 90 degrees;

igure i is a cross-section on the line lV-FV of Figure 3;

Figure 5 is a side elevation 4ot a different form of bar embodying ourinvention;

Figure 6 is a. cross section on the line Jl- Vl of Figure 5;

Figure 7 is a side elevation of the bar of Figure 5 which has beenrotate-d 90 degrecs; and

Figure 8 is a cross-section on the line VHF-VIH of Figure 7.

Figures 9 and 10 represent some. geometrical figures Jfor illustratingthe segments used in the bar. V

Referring to the drawings, the' bar shown in Figures l to 4: comprises aseries of segments l and 2 of tores of elliptical cross section. Thesegments 2 are preferably placed in line with each other, one on eachside of the center line of the bar as shown in Figure 2. The segments lare similar to the segments 2 but are placed, in the bar shown inFigures 1 to 4f, inclusive, 90 degrees Jfrom the segments 2 transverselyoi the bar and are staggered. longitudinally of the bar relatively tothe segments 2. That is to say, the highest point 3 of each of thesegments 2 is equidistant from the highest points l of acent segments 1and, likewise, the highest point 4l of each of the segments l isequidistant from the highest points of two adjacent segments 2.

The segments 2 are joined at their ends by ribs 5 which are deepest attheir central parts, and similarly, the segments l are joined at theirends by ribs 6.

The bar shown in Figures 5 to 87 inclusive, is in principle the same asthat shown in Figures l to 4, inclusive, in that each portion is seltcompensating; but the segments are of different shape; This barcomprises segments 10 which are opposite each other and segments 11 alsoopposite each other, the segments 10 and 'll being staggeredlongitudinally with respect to each other in the same manner asdescribed with respect to segments l and 2. rlhe segments l0 have ribsl2 connecting the same, and the segments l1. have ribs 13 connecting thesame. I'lhe segments and ribs give longitudinal trough-like undulations,and by reason or" the peculiar shape of the segments 10 and 11, thistrough runs in zig-zag form the en tire length bf the bar butvaries'gradually 'in extending from the positionf shofivnini Fgure 6 to thatshown in Figure 8 andy generally along the line l5 which represents Vitslowest point".

For the purpose of illustrationvthe bars may be divided as shovvn by thelines A A' and B B. rhe portion() between theflines,

A and B has its surface undulations so arranged that that portion isconstant-in crosssection on anytra'nsverse line throughout the length ofthe bar and the portion-C may or may not be the sainein crosssectionalarea as the portions D, E and F. ln other Words,A the yarrangemen't of'the undulations is such that a specified-portion ofthe bars isself-compensating as toits sectional area:

By reason of this principle, the sections. C,

ILE and'Fmaybe placed at anylongitudinal relation to each other and abar of uniform total cross-sectional area secured.- This feature has amarked commercial-value" in that f theu undulations; arev produced in'thel barv by mea-nsy of rollsL carrying? the: configurations; Ordinarilythe device is madeby passing the s-arnef through two rolls, theconfiguration for one'vhalf beingon-oneroll andthatof the' other half onthe otheifroll.l` It sometimes happens that f the rolls' slip with!`respect to i each other, inrvvhichieventif' the tot-alerosssectional'area depended uponi-anfgaccurate matching Aof the two rolls? a uniformcrossV sectional lbarwould not be obtained llllith if tions"constituting the bar is therefore unit" our, invention it is immaterialwhether the rolls match-ori not` since: each specified porltin. of the,bai` isselffcompensating andthe resultant of the: combinationy ofthose` pon form quite.` independently of' the' longitudi na'l're'lationxof the portions to eachother. lf a conic, suchias 16 in Figure 105revolvesaabout anaxis in the plane" of one; of

- its axes.y the'bodyy generatedfin this manner is aliled there.. Anypart thereofincluded by af plane and any' portion of the-feurived sur:face maybecalled; aseginent 11'? of a tore'.- j

Eachgsegment ofv our'bar has,4 as shown Figures 9 and 1105 a curvedsurface Which isnpfart of. the surface of a tore, and also, a flatsur-facev which is produced by acutting pl'ane'.V Taking two' segmentsand'. placing theinfifl'it surface against flat surface,A andthen'following at' a predetermined distance with two other" segmentsplaced flat surface against? flatqsurfacef" and staggered Withfre specttot` the nrst segments;` asshown in Figures I, tcl8,-wve,have,vvithI theexception of 'l lthe rlongitud'i'nalIrilbs,.the composition of the#Thepcjo tour, of the sections constituting the'I barf' may beanythingeXcept/acircle or square. The useuof 'segmentslof squarev or circularforinfvvould notgresult in a surface having theI` desirable quali-ties lfor such a bar becaisefjthe surface't would not be" continui ouslyvarying.

such formthat the dies fromvvvhichthey are u rolled'vhave an unusually"long life in that thereare no sharp points ori, angles to ybe providedfor. Many, other advantages' will suggest themselves to those sliilledfinthe art. The surfacey configuration of thebar and` the arrangement ofvthe. parts yare', 'such that. the bar as ai'Whole'hasthroughoutfitslength a constant section'inodnliis about' any axis at rightlanglestothe longitudir'iall axis ofthe har.L i

Thetvvobarsf illustrated in the arefmerely examples, -and" We vvish ittoibo understoodlthat lWe are .not tov be limited'to thev particular.arrangements shown; as many variations. may be made in the configurationof the segments and their arrangement ywith respect tol each other whichwill efnhody the principlesyofr our invention and'va considerably inappearance from the illus"L trations shown.v

l.y A- deformed. concrete reenforcinghalr composed of a pluralityofportions eao'hfcon-I stitutingV lessthan onefhalf. of the aiea-fofthe'bar, ythe transverse cross-'sectional'. area of each of saidportions being.. substantially consti-anty throughout' thelengththereof; said bar having ribs between said portions: substantiallyas described-.f` l y, l i Y 2.V A deformed concrete bar: havingM aVplu.- r'allityof rows of surface undulations so arrangedi that thetransverse sectionaly areak of that portion lying. between planes,cutting the centerliney of adjacent rows isl substantially vuni-formthroughout the length ofthe y bar, the undulations varying transverselycurved! lines acrolssftheface in each.V 4said portion,y substantiallyasj described.; g

3;.; A concretel bar :of substantiallyuni.-

form cross section and. tensile strength'yeoinf y posed of a pluralityofselff-compensating portions. eachI portion having. on everyvtrafnsverse section a curved configurationwhichv vari esf'yvith.respect tofasurface jot any outline beth longitudinally and.transverse-r w ly in a substantially continuous naar1111er'75 sub1-stantially as described. f

4L'.y A concrete bar-.ef substantially unil forni cross section andtensile strength, cornfp'osed of a plurality of,self-compensatingportions having a curved surface `pageevery transverse section, thesection modulus berer/7,37@

ing approximately the same along the bar, so that the resistance isequal to bending stresses in any radial direction throughout its length,substantially as described.

5. A concrete bar of substantially uniform cross section and tensilestrength, composed of a plurality of selfjcompensating portions, eachportion having a surface coniiguration which varies both longitudinallyand transversely in a substantially continuous manner, and surface ribsbetween the said portions, substantially as described.

6. A concrete reeni'orcing bar of substantially uniform cross sectionand tensile strength, composed of a plurality of selfcompensatingportions, having oppositely disposed ribs and oppositely disposedsloping surfaces between the ribs, which merge into the surfaces of theribs, all of the surfaces from beginning to end of each portion varyingin angularity to any radial line, substantially as described.

7. A concrete reenforcing bar of substantially uniform cross section andtensile strength, composed of a plurality o selfcompensating portions ofelliptical cross section varying in diameter from end to end, thegreater diameter of adjacent porvtions being at right angles to eachother,

each end of each portion overlapping the end of the adjacent portion,while the surface of one portion merges into the surface of the adjacentportion.

In testimony whereof we have hereunto set our hands.

CARL G. OHLSON. ALFRED E. J UPP.

